从每小题所给的A、B、C、D四个选项中选出可以填入空白处的最佳选项。
( ) 1. My English is so poor. I really need you help my English.
A. on B. in C. with D. for
( ) 2. The doctors tried their best to save the patient’s life, ______ failed.
A. or B. so C. but D. because
( ) 3.Remember to return the book to the school library in time, __ you will be fined(罚款).
A. or B. and C. but D. then
